Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Expert Solution & Answer
Chapter 17, Problem 15E
Explanation of Solution
a.
Two possible executions:
Case 1:
| A | B | |
| Initially | 0 | 0 |
| After T1 | 0 | 1 |
| After T2 | 0 | 1 |
Consistency met: A=0 ∨ B=0
T Ȣ...
Explanation of Solution
b.
Any interleaving of T1 and T2 results in a non-serializable schedule.
Precedence graph
Explanation of Solution
c.
Explanation:
- There is no parallel execution resulting in a serializable schedule.
- From part a. it is known that a serializable schedule results in A = 0 ∨ B = 0.
- Suppose if started with T1 read(A). Then when the schedule ends, no matter when run the steps of T2, B = 1...
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